8 Flashes
High-pressure switch stuck closed
This code typically points to
- Switch failed closed
- Miswire/jumper
- Tubing/condensate problems can hold switch proved
Next checks to confirm
- Verify switch is open at heat call start
- Inspect switch/tubing/wiring
Escalation
Replace switch only after tubing and wiring are ruled out.
Reset behavior
Clears when switch state is correct on next call.
Urgent
Fix now